Full-face mask and mask cushion therefor

ABSTRACT

A full-face cushion ( 30 B) comprises a substantially triangularly shaped frame ( 32 ) from which extends a membrane ( 34 ). The frame ( 32 ) has a scalloped edge ( 36 ) by which the cushion ( 30 B) is affixed to a mask body ( 46 ) to form a full-face mask ( 60 B). The membrane ( 34 ) has an aperture ( 38 ) into which the wearer&#39;s nose is received. The member ( 34 ) is spaced away from the rim ( 40 ) of the frame ( 32 ), and its outer surface ( 41 ) is of substantially the same shape as the rim ( 40 ). Respective notches ( 42, 44 ) receive the bridge of the wearer&#39;s nose. The wearer&#39;s nose and lips are received through the aperture ( 38 ) into the chamber within the mask body ( 46 ). The seal forming portion ( 45 ) thus contacts both the surface of the wearer&#39;s nose and a portion of the wearer&#39;s face in the region between the bottom lip and the chin, and around the sides and over the bridge of the nose. The shape of the seal forming portion ( 45 ) is particularly suited to effectively seal the difficult region of the facial contour that is the crease between the sides of the nose and the face.

FIELD OF THE INVENTION

[0001] The invention relates generally to a full-face (i.e. nose and mouth) mask and to a cushion therefor, for example, for use in the treatment of respiratory conditions and in assisted respiration.

BACKGROUND OF THE INVENTION

[0002] Full-face masks are commonly used in the treatment of respiratory conditions and sleep disorders (e.g., obstructive sleep apnea) by delivering a flow of breathable gas for, or to assist, patient respiration. These masks typically receive a gas supply line which delivers gas into a chamber formed by walls of the mask. The walls usually are semi-rigid and have a face contacting portion including an aperture which is generally aligned with the wearer's nostrils and mouth. The face contacting portion can comprise a soft, resilient elastomeric material which may conform to various facial contours. The mask normally is secured to the wearer's head by straps. The straps are adjusted to pull the mask against the face with sufficient force to achieve a gas tight seal between the mask and the wearer's face. Gas is thus delivered to the mask and through the aperture to the wearer's nasal passages and throat.

[0003] Problems often arise with masks of the above configuration. For example, the mask may be dislodged, thereby breaking the seal between the mask and wearer. This may occur if the wearer rolls over when sleeping thereby creating a drag force on the gas supply line which is transmitted to the mask, breaking the seal. In the case of a mask being used for the administration of Continuous Positive Airway Pressure (CPAP) treatment for the condition obstructive sleep apnea, such a leak can result in the pressure supplied to the entrance of the wearer's airway being below the therapeutic value, and the treatment becoming ineffective.

[0004] Another problem is that the face contacting portion may apply excessive pressure to the wearer's face resulting in discomfort and possibly skin irritation. This can occur because the face contacting portion has to distort beyond its normal range of elasticity to conform to certain facial contours which requires the application of excessive forces. In some cases these excessive pressures and forces may cause the face to distort to conform with the face contacting portion to increase wearer discomfort, facial soreness and ulceration.

[0005] It is an object of the invention to overcome or at least substantially ameliorate one or more of the foregoing disadvantages.

SUMMARY OF THE INVENTION

[0006] In one broad form, the invention discloses a full-face mask cushion to sealingly connect a mask to a wearer's face, the cushion comprising:

[0007] a nasal bridge region, a cheek region and a chin region;

[0008] a first membrane comprising a substantially triangularly-shaped frame of resilient material having a first molded inwardly curved rim;

[0009] a second membrane of resilient material, said second membrane being thinner than said first membrane, said second membrane having a second molded inwardly curved rim, said second membrane curved rim spaced a first distance from said first membrane curved rim in said cheek region and said second membrane curved rim spaced a second distance from said first membrane curved rim in said nasal bridge region, said second distance greater than said first distance, said distances measured when the mask is not in use, a portion of said second membrane curved rim forming a face contacting seal.

[0010] Preferably, the rim and seal portion are shaped to generally match facial contours of the facial tissue around the sides and over the bridge of the nose and between the bottom lip and the chin.

[0011] In one particularly advantageous form, the membrane is substantially saddle-shaped. The membrane further has a centrally located aperture through which the wearer's nose and mouth pass to enter said cavity.

[0012] It is preferred that the cushion and membrane each include a co-located notch to accommodate the bridge of the nose of the wearer. Typically, the seal portion contacts at least the wearer's nose, and preferably, also the facial tissue around the sides and over the bridge of the nose and between the bottom lip and the chin.

[0013] The invention further discloses a full-face mask for connection to a wearer's face comprising:

[0014] a mask body for connection with a supply of breathable gas; and

[0015] a full-face cushion secured to said mask body, the body and cushion forming a nose and mouth-receiving cavity, said cushion including:

[0016] a nasal bridge region, a cheek region and a chin region;

[0017] a substantially triangularly-shaped first membrane of resilient material having a first molded inwardly curved rim to surround wearer's nose;

[0018] a second membrane also of resilient material, said second membrane being relatively more flexible than said first membrane, said second membrane having a second molded inwardly curved rim, said second molded rim being of the same general shape as said first molded rim and fixed to and extending away from said first membrane so as to have a second membrane inner surface spaced a first distance from an outer surface of said first molded rim in said cheek region and said second membrane inner surface spaced a second distance from said first membrane outer surface of said first molded rim in said nasal bridge region, said second distance greater than said first distance, said distances measured when the mask is not in use, a portion of said second molded rim forming a face contacting seal; and

[0019] wherein said seal portion is substantially coterminous with respect to said second molded rim and is resiliently deformable towards said first membrane in use of said mask.

[0020] The mask body can further include attachment points from which securing straps can be attached, and by which the mask can be secured to the wearer's head. The nasal mask can yet further comprise an arm depending from said body from which a further securing strap(s) can be attached.

[0021] The invention further discloses a CPAP treatment apparatus comprising:

[0022] a flow generator for the supply of gas at a pressure elevated above atmospheric pressure;

[0023] a gas delivery conduit coupled to said flow generator; and

[0024] a full-face mask in turn coupled to said conduit to said nasal mask including:

[0025] a mask body for connection with a supply of breathable gas; and

[0026] a full-face cushion secured to said mask body, the body and cushion forming a nose and mouth-receiving cavity, the cushion including:

[0027] a nasal bridge region, a cheek region and a chin region;

[0028] a substantially triangularly-shaped first membrane of resilient material having a first membrane having a molded inwardly curved rim;

[0029] a second membrane having a second molded inwardly curved rim also of resilient material, said second membrane being relatively more flexible than said first membrane, and being of the same general shape as said first molded inwardly curved rim and fixed to and extending away from said first membrane so as to have an inner surface spaced a first distance from said first molded rim in said cheek region and said second membrane inner surface spaced a second distance from said first molded rim, said second distance greater than said first distance, said distances measured when the mask is not in use, a portion of said second molded rim forming a face contacting seal; and

[0030] wherein said seal portion is generally coterminous with respect to said second molded rim and is resiliently deformable towards said first membrane in use of said mask.

[0031] In one particularly preferred form, a supply of gas can be provided to said cavity, said supply of gas assisting, but not solely causing maintenance of a seal by said seal forming portion of said membrane to the face of the wearer in use of the cushion.

[0032] Advantageously, because the membrane and the rim are substantially shaped to the facial contour, and the membrane does not need to turn in on itself, as in the prior art, thus contacting the face without folds or creases. With the cushion/mask secured to the wearer's head, the headstraps need only to be tensioned to balance the force due to mask gas pressure that tends to lift the mask off the face. Such relatively lower mask-to-face pressure results in greater patient comfort, and a reduction in the likelihood of skin irritation.

BRIEF DESCRIPTION OF THE DRAWINGS

[0033] An embodiment of the invention will now be described with reference to the accompanying drawings, in which:

[0034]FIG. 1 is a rear perspective view of a nasal mask cushion embodying the present invention;

[0035]FIG. 2 is a cross-sectional view of the cushion shown in FIG. 1 along line 2-2;

[0036]FIG. 3 is a perspective view of a nasal mask including the cushion of FIGS. 1;

[0037]FIG. 4 is a perspective view of the nasal mask of FIG. 3 secured to a wearer's head;

[0038]FIG. 5 is a side view of the mask cushion shown in FIG. 1;

[0039]FIG. 6 is a front view of the mask cushion shown in FIG. 1;

[0040]FIG. 7 is a rear view of the mask cushion shown in FIG. 1;

[0041]FIG. 8 is a cross sectional view of the mask shown in FIG. 1 along line 8-8 of FIG. 7;

[0042]FIG. 9 is a cross sectional view of the mask shown in FIG. 1 along line 9-9 of FIG. 7;

[0043]FIG. 10 is a front perspective view of a full-face mask cushion embodying the present invention;

[0044]FIG. 11 is a perspective view of a full-face mask including the cushion of FIG. 10;

[0045]FIG. 12 is an underside view of the mask cushion shown in FIG. 10;

[0046]FIG. 13 is a front view of the mask cushion shown in FIG. 10;

[0047]FIG. 14 is a rear view of the mask cushion shown in FIG. 10;

[0048]FIG. 15 is a cross sectional view of the mask cushion shown in FIG. 10 along line 15-15 of FIG. 14;

[0049]FIG. 16 is a cross sectional view of the mask cushion shown in FIG. 10 along line 16-16 of FIG. 14; and

[0050]FIG. 17 is a perspective view of the mask shown in FIG. 11 secured to a wearer's face.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0051] FIGS. 1 to 9 show a nasal cushion 30A and a nasal mask 60A embodying the present invention.

[0052]FIG. 1 is a perspective view of the nasal cushion 30A. FIG. 3 is a perspective view of the nasal cushion 30A attached to a mask body 46 to form the nasal mask 60A.

[0053] The nasal cushion 30A comprises a substantially triangularly shaped frame 32 from which extends a membrane 34. The frame 32 has a scalloped edge 36 by which the nasal cushion 30A is affixed to the mask body 46, as presently will be described.

[0054] The membrane 34 has an aperture 38 into which the wearer's nose is received in use of the nasal cushion 30A. The membrane 34 is spaced away from the rim 40 of the frame 32, and its outer surface 41 is of substantially the same shape as the rim 40. The outer surface 41 of the membrane 34 and the rim 40 of the frame 32 also can be described as generally saddle shaped. The shaping of the outer surface 41 of the membrane 34 and the rim 40 of the frame 32 also include respective notches 42,44 that receive the bridge of the wearer's nose in use of the nasal cushion 30A.

[0055] As is best seen in FIG. 2, the frame 32 and the membrane 34 are integrally formed, typically in a one-shot molding process. The frame 32 and the membrane 34 are fabricated from a resilient material. One suitable such material is SILASTIC™ silicone elastomer manufactured by Dow Corning. The frame 32, in a preferred embodiment, has a typical thickness at its rim 40 of 1.5 mm. The membrane 34, in a preferred embodiment, has a typical thickness of 0.35 mm. In this way, the membrane 34 is relatively more flexible than the rim 40.

[0056] In use of the nasal cushion 30A, a wearer's nose will be inserted in the aperture 38 to engage a seal forming portion 45 (formed between the dashed lines) of the outer surface 41 to cause deformation of the membrane 34. Depending upon the securing force supplied to the membrane 34, it may deform to a point where it butts against the rim 40 of the frame 32. The frame 32 has a rigidity sufficient to withstand usual securing pressures in use of the nasal cushion 30A to tend to retain its shape and resist deformation. It thus acts as a supporting structure.

[0057] Referring now to FIG. 3, the nasal cushion 30A is shown attached to the mask body 46 by the edge 36 of the frame 32, adhered or otherwise secured to a flange 48 of the mask body 46. Only the outer surface 41 of the membrane 34 can be seen. The flange 48 includes two lower slots 50 and 54 from which a first tensioning strap 68 can be attached to secure the cushion 30 and the mask body 46 (in combination) to the head of a wearer.

[0058] The mask body 46 forms a cavity that can receive the nose of the wearer by the aperture 38. A port 56 is provided at the top of the mask body 46 by which breathable gas can be supplied to the chamber.

[0059] Referring now to FIG. 4, a coupling tube 62 is shown above the nasal mask 60A. The coupling tube 62 is connected at one end with the inlet port 56, and at the other to a socket 64 into which can be received a gas delivery tube 65 for the supply of breathable gas to the chamber internal of the mask body 46 from a flow generator 67. The mask body 46 also has two vent openings 66 by which expired gas is exhausted. The first fastening strap 68 is fixed between the two lower slots 50,54. An upper slot 52 receives an arm 70, the top end of which has a resilient pad 72 to engage the forehead of the wearer. The arm 70 has two slots, only one slot 74 shown, along its side edges, by which a second fastening strap 78 is secured.

[0060] In fitting the nasal mask 60A, the wearer's nose is received rough the aperture 38 into the chamber within the mask body 46. The seal forming portion 45 thus contacts both the surface of the wearer's nose and a portion of the wearer's face in the region between the base of the nose and the upper lip, and around the sides and over the bridge of the nose. The shape of the seal forming portion 45 is particularly suited to effectively seal the difficult region of the facial contour that is the crease between the sides of the nose and the face. Depending upon the tension applied by the first and second fastening straps 68,78, a seal is formed with the membrane 34 remaining spaced from the rim 40 of the cushion frame 32. While the provision of pressurised gas to the chamber of the mask body 46 assists in the maintenance of a seal between the membrane 34 and the wearer's nose and face, it is not essential in most cases, and an effective seal will be formed absent any such pressurised gas. When relative movement of the nasal mask 60A in relation to the wearer's head, the nose will be restrained by contacting the frame 32. Thus only limited relative motion between the nasal mask 60A and the wearer's nose and face occurs.

[0061] The membrane 34 closely imitates the facial contour, and because of its relatively lesser stiffness than the frame 32, can conform to particular facial structures with minimum force, and without a tendency to fold or crease.

[0062] If the fastening straps 68 and 78 are tensioned to excess, the membrane 34 deforms to abut the rim 40 of the cushion 30A, the frame 32 thus acting as an “end limit”. In such a configuration, almost zero relative movement can occur between the nasal mask 60A and the wearer's head.

[0063] FIGS. 10 to 17 show a full-face cushion 30B and a full-face mask 60B embodying the present invention. Like reference numerals to those used in describing the “nasal” embodiment of FIGS. 1 to 9 shall be used to denote like features of the “full-face” embodiment of FIGS. 10 to 17.

[0064]FIG. 10 is a perspective view of the full-face cushion 30B. FIG. 11 is a perspective view of the full-face cushion 30B attached to a mask body 46 to form the full-face mask 60B.

[0065] The full-face cushion 30B comprises a substantially triangularly shaped frame 32 from which extends a membrane 34. The frame 32 has a scalloped edge 36 by which the full-face cushion 30B is affixed to the mask body 46, as presently will be described.

[0066] The membrane 34 has an aperture 38 into which the wearer's nose and lips are received in use of the full-face cushion 30B. The membrane 34 is spaced away from the rim 40 of the frame 32, and its outer surface 41 is of substantially the same shape as the rim 40. The outer surface 41 of the membrane 34 and the rim 40 of the frame 32 also can be described as generally saddle shaped. The shaping of the outer surface 41 of the membrane 34 and the rim 40 of the frame 32 also include respective notches 42,44 that receive the bridge of the wearer's nose in use of the full-face cushion 30B.

[0067] As is best seen in FIG. 16, the frame 32 and the membrane 34 are integrally formed, typically by in a one-shot molding process. The frame 32 and the membrane 34 are fabricated from a resilient material. One suitable such material is SILASTIC™ silicone elastomer manufactured by Dow Corning. The frame 32, in a preferred embodiment, has a typical thickness at its rim 40 of 1.5 mm. The membrane 34, in a preferred embodiment, has a typical thickness of 0.35 mm. In this way, the membrane 34 is relatively more flexible than the rim 40.

[0068] In use of the full-face cushion 30B, a wearer's nose and lips will be inserted in the aperture 38 to engage a seal forming portion 45 (formed inside the dashed line, see FIG. 13) of the outer surface 41 to cause deformation of the membrane 34. Depending upon the securing force supplied to the membrane 34, it may deform to a point where it butts against the rim 40 of the frame 32. The frame 32 has a rigidity sufficient to withstand usual securing pressures in use of the full-face cushion 30B to tend to retain its shape and resist deformation. It thus acts as a supporting structure.

[0069] Referring now to FIG. 11, the full-face cushion 30B is shown attached to the mask body 46 by the edge 36 of the frame 32, adhered or otherwise secured to a flange 48 of the mask body 46. Only the outer surface 41 of the membrane 34 can be seen. The mask body 46 includes two lower slots 50 and 54 and two upper slots 74 and 76 from which first and second tensioning straps 68 and 78 can respectively be attached to secure the cushion 30B and the mask body 46 (in combination) to the head of a wearer.

[0070] The mask body 46 forms a cavity that can receive the nose and lips of the wearer by the aperture 38. A port 56 is provided at the front of the mask body 46 by which breathable gas can be supplied to the chamber.

[0071] Referring now to FIG. 17, a coupling elbow 62 is shown connected at one end with the inlet port 56, and at the other to a socket 64 into which can be received a gas delivery tube 65 for the supply of breathable gas to the chamber internal of the mask body 46 from a flow generator 67. The mask body 46 also a vent opening 66 by which expired gas is exhausted. The first fastening strap 68 is fixed between to the lower two slots 50 and 54. The second fastening strap 78 is secured between the two upper slots 74 and 76. The first and second straps 68 and 78 are joined at each side by a bridging portion 79.

[0072] In fitting the full-face mask 60B, the wearer's nose and lips are received through the aperture 38 into the chamber within the mask body 46. The seal forming portion 45 thus contacts both the surface of the wearer's nose and a portion of the wearer's face in the region between the bottom lip and the chin, and around the sides and over the bridge of the nose. The shape of the seal forming portion 45 is particularly suited to effectively seal the difficult region of the facial contour that is the crease between the sides of the nose and the face. Depending upon the tension applied by the first and second fastening straps 68,78, a seal is formed with the membrane 34 remaining spaced from the rim 40 of the cushion frame 32. While the provision of pressurised gas to the chamber of the mask body 46 assists in the maintenance of a seal between the membrane 34 and the wearer's nose and face, it is not essential in most cases, and an effective seal will be formed absent any such pressurised gas. When relative movement of the full-face mask 60B in relation to the wearer's head, the nose will be restrained by contacting the frame 32. Thus only limited relative motion between the full-face mask 60B and the wearer's nose and face occurs.

[0073] The membrane 34 closely imitates the facial contour, and because of its relatively lesser stiffness than the frame 32, can conform to particular facial structures with minimum force, and without a tendency to fold or crease.

[0074] If the fastening straps 68 and 78 are tensioned to excess, the membrane 34 deforms to abut the rim 40 of the cushion 32, the frame 32 thus acting as an “end limit”. In such a configuration, almost zero relative movement can occur between the full-face mask 60B and the wearer's head.

[0075] The nasal cushion 30A, the nasal mask 60A, the full-face cushion 30B and the full-face mask 60B have been described with reference to CPAP or assisted respiration treatment, however it is to be understood that the invention generally is applicable to any application where gas and/or atomised liquid is to be supplied to the entrance of the airways. Such applications include nebulisers, gas masks and anaesthetic machines. 

We claim:
 1. A full-face mask cushion to sealingly connect a mask to a wearer's face, the cushion comprising: a nasal bridge region, a cheek region and a chin region; a first membrane comprising a substantially triangularly-shaped frame of resilient material having a first molded inwardly curved rim; a second membrane of resilient material, said second membrane being thinner than said first membrane, said second membrane having a second molded inwardly curved rim, said second membrane curved rim spaced a first distance from said first membrane curved rim in said cheek region and said second membrane curved rim spaced a second distance from said first membrane curved rim in said nasal bridge region, said second distance greater than said first distance, said distances measured when the mask is not in use, a portion of said second membrane curved rim forming a face contacting seal.
 2. A cushion as claimed in claim 1, wherein said second molded rim and said first molded rim have a co-located notch to accommodate the bridge of a wearer's nose.
 3. A cushion as claimed in claim 2, wherein said first membrane molded rim and said second membrane molded rim are substantially saddle-shaped.
 4. A cushion as claimed in claim 3, wherein said second membrane is shaped so that said seal portion, in use, contacts at least a wearer's nose.
 5. A cushion as claimed in claim 4, wherein said seal portion, in use, contacts the facial tissue around the sides and over the bridge of the nose, and between the bottom lip and the chin.
 6. A cushion as claimed in claim 1, wherein said second rim and seal portion are shaped to generally match facial contours in the region of facial tissue around the sides and over the bridge of the nose, and between the bottom lip and the chin.
 7. A cushion as claimed in claim 1, wherein the first and second membranes comprise one molded piece, without being adhered together by an adhesive.
 8. The nasal mask cushion of claim 1, wherein the first molded inwardly curved rim of said first membrane is approximately 1.5 mm thick.
 9. The nasal mask cushion of claim 1, wherein the second molded inwardly curved rim of the second membrane is approximately 0.35 mm thick.
 10. A full-face mask for connection to a wearer's face comprising: a mask body for connection with a supply of breathable gas; and a full-face cushion secured to said mask body, the body and cushion forming a nose and lips-receiving cavity, said cushion including: a nasal bridge region, a cheek region and a chin region; a substantially triangularly-shaped first membrane of resilient material having a first molded inwardly curved rim to surround wearer's nose; a second membrane also of resilient material, said second membrane being relatively more flexible than said first membrane, said second membrane having a second molded inwardly curved rim, said second molded rim being of the same general shape as said first molded rim and fixed to and extending away from said first membrane so as to have a second membrane inner surface spaced a first distance from an outer surface of said first molded rim in said cheek region and said second membrane inner surface spaced a second distance from said first membrane outer surface of said first molded rim in said nasal bridge region, said second distance greater than said first distance, said distances measured when the mask is not in use, a portion of said second molded rim forming a face contacting seal; and wherein said seal portion is substantially coterminous with respect to said second molded rim and is resiliently deformable towards said first membrane in use of said mask.
 11. A mask as claimed in claim 10, wherein said mask body includes attachment points.
 12. A mask as claimed in claim 11, further comprising securing straps fixed to said attachment points.
 13. A mask as claimed in claim 12, wherein said second membrane molded rim and said first membrane molded rim each have a co-located notch to accommodate the bridge of a nose.
 14. A mask as claimed in claim 13, wherein said first and second molded rims are substantially saddle-shaped.
 15. A mask as claimed in claim 14, wherein said second membrane is shaped so that said seal portion, in use, contacts at least the wearer's nose.
 16. A mask as claimed in claim 14, wherein said seal portion, in use, contacts the facial tissue around the sides and over the bridge of the nose, and between the bottom lip and the chin.
 17. A mask as claimed in claim 10, wherein said rim and said seal portion are shaped to generally match facial contours in the region of facial tissue around the sides and over the bridge of the nose, and between the bottom lip and the chin.
 18. A CPAP treatment apparatus comprising: a flow generator for the supply of gas at a pressure elevated above atmospheric pressure; a gas delivery conduit coupled to said flow generator; and a full-face mask in turn coupled to said conduit to said nasal mask including: a mask body for connection with a supply of breathable gas; and a full-face cushion secured to said mask body, the body and cushion forming a nose and lips-receiving cavity, the cushion including: a nasal bridge region, a cheek region and a chin region; a substantially triangularly-shaped first membrane of resilient material having a first membrane having a molded inwardly curved rim; a second membrane having a second molded inwardly curved rim also of resilient material, said second membrane being relatively more flexible than said first membrane, and being of the same general shape as said first molded inwardly curved rim and fixed to and extending away from said first membrane so as to have an inner surface spaced a first distance from said first molded rim in said cheek region and said second membrane inner surface spaced a second distance from said first molded rim, said second distance greater than said first distance, said distances measured when the mask is not in use, a portion of said second molded rim forming a face contacting seal; and wherein said seal portion is generally coterminous with respect to said second molded rim and is resiliently deformable towards said first membrane in use of said mask.
 19. The CPAP treatment apparatus as claimed in claim 18, wherein said mask body includes attachment points.
 20. The CPAP treatment apparatus as claimed in claim 19, further comprising securing straps fixed to said attachment points.
 21. The CPAP treatment apparatus as claimed in claim 20, wherein said first and second molded rims each have a co-located notch to accommodate the bridge of a nose.
 22. The CPAP treatment apparatus as claimed in claim 21, wherein said first and second molded rims are substantially saddle-shaped.
 23. The CPAP treatment apparatus as claimed in claim 22, wherein said second membrane is shaped so that said seal portion, in use, contacts at least wearer's nose.
 24. The CPAP treatment apparatus as claimed in claim 23, wherein said seal portion, in use, contacts the facial tissue around the sides and over the bridge of the nose, and between the bottom lip and the chin.
 25. The CPAP treatment apparatus as claimed in claim 18, wherein said second molded rim and said seal portion are shaped to generally match facial contours in the region of facial tissue around the sides and over the bridge of the nose, and between the bottom lip and the chin. 